Oral appliance



FIG. 1 is a top, front, right side perspective view of an oral appliance;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevational view, the left side being a mirror image thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines in the drawings are included for the purpose of illustrating portions of the oral apppliance and form no part of the claimed design. 

CLAIM The ornamental design for an oral appliance, as shown and described. 